Our ignorance can be divided into problems and mysteries. When we face a problem, we may not know its solution, but we have insight, increasing knowledge, and an inkling of what we are looking for. When we face a mystery, however, we can only stare in wonder and bewilderment, not knowing what an explanation would even look like.

The military has a huge role in the economy [of Pakistan] with big stakes and, as you say, it has constantly intervened to make sure that it keeps its hold on policy making. Well, I hope, and there seem to be some signs, that the military is taking a backseat, not really in the economy, but in some of the policy issues. If that can continue, which perhaps it will, this will be a positive development.

Take Cuba. A very large majority of the U.S. population is in favor of establishing diplomatic relations with Cuba and has been for a long time with some fluctuations. And even part of the business world is in favor of it too. But the government won't allow it.

The reason academic disputes are so vicious is that so little is at stake.

Surely no rational or realistic person will discount the possibility that [during wartime] the United States might suddenly resort to nuclear weapons. Those who retain the instinct for survival, not to speak of minimal concern for their fellow man, will seek ways to act before rather than after the event.

Power has to be protected from scrutiny. That's the principle of every dictatorship, of every autocracy. You hear it from high priests at Harvard and every government department, that power has to be kept secret otherwise it will fade and it won't work. But Bradley Manning is violating that principle.

Women taking care of children . . . it makes sense to pay them for that work . . . they should be paid for it, but that requires tax payments. And the same is true about protection of the environment.